The core of a computer system is normally the CPU or central processing unit or processor. This processor connects to a motherboard. The motherboard serves as a connector for all hardware components, modems, memory, drives, and peripherals. A modem is a piece of hardware that helps your computer communicate with other computers. The modem modulates and demodulates analog signals between a phone line and your computer's data.
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The purpose of the modem is to modulate and demodulate the electonic analog pulses of the computer to pulses the phone system can handle.Modem is used to connect one or more devices. It is also used to connect internet.the full form of modem is modulator demodulator.
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The PC system case is is the metal shell that surrounds the individual PC components. It is also often called a "computer case", "computer tower", or some people call it the "CPU". However CPU is, by definition, only one component in the case.
A person will need an outlet in order to plug a computer in order to have a computer working in a lab. They will also need the cords to hook the monitor to the tower.
Basically, modem is used to connect the analog world to the digital world. In other words, you can say it is the device that is used to convert the analog signal to digital signal. For eg. the modem connected with a computer is usually converts the analog signal that comes through the wire to the digital bit bcoz computer can only understands the digital signal...